Crime Prevention, Arrests, Training, Techniques to be Reviewed

WASHINGTON—Outgoing Attorney General Eric Holder is urging the broadest review of police tactics in more than a generation, calling for a new effort to tackle difficult questions about how officers patrol communities, prevent crime, and arrest suspects.

Mr. Holder, who has voiced concerns about police conduct since an unarmed 18-year-old was shot and killed by an officer in Ferguson, Mo. in August, spoke Wednesday in Little Rock, Ark. at a meeting of police chiefs organized by the U.S. Conference of Mayors.